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Physical vs. logical / soft delete of database record?
..., the ammount of infrastructure to keep and manage terrabytes of data both online and off line is a lot. It takes a lot of disk for redundancy, and people's time to ensure backups are moving swiftly etc.
When deciding to use logical, physical deletes, or archiving I would ask myself these question...
Principal component analysis in Python
....pdot
__version__ = "2010-04-14 apr"
__author_email__ = "denis-bz-py at t-online dot de"
#...............................................................................
class PCA:
def __init__( self, A, fraction=0.90 ):
assert 0 <= fraction <= 1
# A = U . diag(d) . V...
Why can't C++ be parsed with a LR(1) parser?
...ding a scannerless GLL parser. Work in progress, might be hard to find any online information. en.wikipedia.org/wiki/RascalMPL
– Ira Baxter
Aug 21 '10 at 21:46
...
What's the difference between “groups” and “captures” in .NET regular expressions?
...is the opposite. Why greedy is faster than lazy is explained in many texts online and by friedl's book, but OT here. Maybe the other question (which?) was not a true duplicate?
– Abel
Feb 28 '17 at 7:23
...
What is the best way to stop people hacking the PHP-based highscore table of a Flash game
...
I made a online game community, and we designed our entire reward system to reward a top 10th percentile score instead of just the highest scorer and it has worked out great, so trying to sidestep around the problem helps too!
...
“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
...e' : 'false');
echo "\n";
});
Test the above snippet in the 3v4l.org online PHP editor
Although PHP does not require a variable declaration, it does recommend it in order to avoid some security vulnerabilities or bugs where one would forget to give a value to a variable that will be used late...
UDP vs TCP, how much faster is it? [closed]
...epends on your connection, upstream networks, etc. I used to play a lot of online games, and I would find that if it was just me using the internet connection, I'd get no packet loss, but as soon as I'd launch a background download, I'd start to get some (maybe 10%-20%). This was about 5 years ago t...
How does libuv compare to Boost/ASIO?
...theless: http://en.highscore.de/cpp/boost/index.html ). Libuv has only one online book (but also good) http://nikhilm.github.com/uvbook/index.html and several video talks, so it will be difficult to know all the secrets (this library has a lot of them). For more specific discussion of functions see ...
WebSockets protocol vs HTTP
..., Stock market prices updating in real-time, chat, multiplayer games, live online collaboration tools, etc.
You can check out a deep dive article on Websockets which explains the history of this protocol, how it came into being, what it’s used for and how you can implement it yourself.
Here's a ...
What is “entropy and information gain”?
... bayesian methods and MaxEnt. The place to start is this (freely available online) book by David Mackay:
http://www.inference.phy.cam.ac.uk/mackay/itila/
Those inference methods are really far more general than just text mining and I can't really devise how one would learn how to apply this to NLP...